Lathe-chuck



(No Model.)

0. R. MEAD. LATHE CHUCK.

No. 408,985.. v Patented Aug. 13, 1889.

UNITED STATES PATENT OFFICE.

CHARLES R. MEAD, OF ONEIDA, NEW YORK.

LATHE-:CHUCK.

SPECIFICATION forming part of Letters Patent No. 408,985, dated August13, 1889.

Application filed May 16, 1889.

To all whom it may concern:

Be it known that I, CHARLES R. MEAD, of Oneida, in the county ofMadison, in the State of New York, have invented new and usefulImprovements in Lathe-Chucks, of which the. following, taken inconnection with the accompanying drawings, is a full, clear, and exactdescription.

My invention relates to an improved lathechuck of the character forwhich I have obtained Letters Patent of the United States, No. 321,740,dated July 7, 1885, and No. 372,482, dated November 1, 1887; and it hasfor its object the production of a simple and effective construction ofchuck, which shall be more effective and durable in use, and which shallbe more cheaply constructed and easily put together than thoseheretofore devised; and to this end it consists, essentially, in arecessed head for the chuck, an annular ring or disk closely fittingsaid recessed head and provided upon' its periphery with screwthreadsengaged by a screw running transversely through the said chuck-head,dogs or jaws pivoted to the chuck-head and provided with a crank-armengaging the annular ring and rotated thereby when the transverseactuating-screw rotates the disk or annular ring.

It furthermore consists in the detail construction and arrangement ofthe parts, all as hereinafter more particularly described, and pointedout in the claims.

In describing my invention reference is had to the accompanyingdrawings, forming a part of this specification, in which like lettersindicate corresponding parts in all the views.

Figure 1 is an elevation of my improved chuck. Fig. 2 is a longitudinalsectional view taken on line mtg-Fig. 1, illustrating the relativeconstruction and arrangement of the parts. Fig. 3 is a face view of thechuck, illustrating the face or covering plate, the jaws, and the screwfor operating said jaws. Fig. 4 is a horizontal sectional view of thelathe-chuck, taken on line y y, Fig. 2, clearly Serial N0. 3111013. (Nomodel.)

6 is a top plan view of the jaw illustrated in Fig. 5 and Fig. 7 is anelevation of the annular ring provided with slots or cut-outs forengaging the crank-arms provided upon the jaws of the chuck, andprovided with a groove on its outside periphery for engaging theoperatingscrew journaled transversely in the chuck-head.

A represents the chuck-head, which may be of any desirable form orconstruction for use in any particular style of machine. The forwardextremity of the chuck-head A is pro vided with an annular recess orsocket A, concealed by a covering plate or cap B, which is preferablysecured by screws Z) to the front face of said chuck-head.

0 represents the chuck-j aw, which is interposed between the inner faceof the coveringplate B and the adjacent face A of the recess A. Thesejaws are provided with trunnions c c, journaled in the face A of thechuckhead and the adjacent face of the coveringplate B.

Mounted within the recess A, and preferably closely fitting theperiphery thereof, is the annular sleeve or disk D, which is provided onits outside periphery with a groove d, having a portion thereofscrew-threaded and engaging a screw E.

Provided upon the disk D are the cut-outs (Z of an equal number to thatof the chuckjaws and of suitable form to engage and operate thecrank-arms 0, provided upon the chuck-jaws.

The screw E is journaled in the chuck-head, preferably in ahorizontalplane, and is provided at one extremity with the shoulder e,abutting against a like shoulder a of the chuck-head, and is provided atthe other extremity with a screw-threaded spindle 6, engaging a nut E,which nut abuts against a shoulder a, formed upon the chuck-head. Thisscrew preferably extends beyond this journal-bearing but a shortdistance, so that the liability of objects being caught thereby isentirely obviated. In order to turn said screw, I provide the handle F,which is detachable therefrom, and with a projection f engages a slot 6or other opening in said screw.

By reference to the drawings and the foregoing description it will beseen that when the handle F is turned the screw E is also turned, andits threads engage the screwthreads of the groove d of the rotatablesleeve D. As the sleeve D is rotated, the cut-outs d engage thecrank-arms c of the jaws C and revolve the jaws either toward or awayfrom each other, according to the rotation of the said sleeve. The plate13 is provided with an opening I), centering with the hearing or bitingsurfaces 0 of said jaws C; and it will be seen that these jaws have anadjustment equal to the peripheryof said opening I). This operation oradjustment of the jaws is very certain and strong, as the screwturnspositively and is prevented from longitudinal movement by reason ofthe shoulders e and the nut E. The rotation of the disk D, by means ofthe engagement thereof with the crank-arms c, is thus utilized to rotatethe chuck-jaws upon their pivots. Moreover, the sleeve D engages thechuck-jaws C by a leverage, and it will be seen that the nearer thesejaws approach each other the more powerful is their action. Thus byutilizing the screw-engagement of the screw E and the sleeve D, and theengagement of the sleeve or ring D at a leverage with the crank-arms c,I obtain a very powerful chuck.

The parts of my improved lathe-ehuek are very simple in construction andare very easily manufactured, and are readily assembled without muchfitting thereof, thus producing at a very slight cost a very powerfulchuck, which possesses features of great advantage.

The operation of myinvention will be readily perceived from theforegoing, and it will be understood that considerable change may bemade in the relative construction and arrangement of the parts withoutdepartin from the spirit of my invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. A jaw for aehuek having the bearing or biting surface 0 pivot-pointsor trunnions'c, and crank-arms c, substantially as and for the purposespecified.

2. The combination of the chuck-head, jaws pivoted to the chuck-head, anannular rotatable ring for engaging said jaws, and revolving to adjustand clamp the same, substantially as and for the purpose specified.

3. The combination of the chuck-head, the covering-plateB, jaws pivotedto said head and plate, and a rotatable sleeve for engaging said jaws,and revolving to adjust and clamp the same, substantially as and for thepurpose described.

4. The combination of the chuck-head, jaws pivoted to the chuck-head,and crank-arms provided upon the jaws, and the rotatable sleeve forengaging said jaws, and revolving to adjust and clamp the same,substantially as and for the purpose specified.

5. The combination of the chuck-head, jaws pivoted to the chuck-head,and crank-arms provided upon the jaws, the rotatable sleeve, slots orcut-outs provided in the sleeve, and a screw for engaging said disk andretating the same, substantially as and for the purpose specified.

In testimony whereof I have hereunto signed my name, in the presence oftwo attesting witnesses, at Syracuse, in the county of Onondaga, in theState of New York, this 29th day of April, 1889.

CHARLES R. MEAD.

\Vitnesscs:

A. E. PARSONS, CLARK ll. NORTON.

